<<There is a good chance that numbers 3 and 4 could be Venus - often quite visible in broad daylight high overhead, and lookslike a wx balloon. I know cos I saw the shiny object as you described and it took me a while to ascertain what it was.>>
Many thanks for the feedback CT. Unfortunately it wasn't Venus, which at the time was much lower in the western sky. The object we saw was virtually overhead - just a little northeast - to start and it gradually moved eastward. Venus would move towards the northwest, getting lower, so it was in a wholly different area of the sky.